Yes, because I want to learn English, so he wants to speak, write and read to that will be used for work and talk to communicate whether the talk over the phone or by email.
Yes, because I want to learn English, so to speak, write and read out. In order to be used in the work and talk communication, whether on the phone or via email.
Yes, because I want to learn English to speak, write and read out to be used at work and talk communicate either as the talking on the phone. Or by e-mail!